That Ukraine “drill” may be coming at just the right time. Just out from Reuters:

RUSSIAN TROOPS OPENED FIRE DURING TAKEOVER OF UKRAINIAN MILITARY POST IN CRIMEA, NO ONE WOUNDED -INTERFAX QUOTES UKRAINIAN BASE COMMANDER
And at the same time:

RUSSIA’S PUTIN SAYS TOLD FOREIGN MINISTER LAVROV TO INVITE U.S. COUNTERPART KERRY FOR MORE CONSULTATIONS ON UKRAINERUSSIAN FOREIGN MINISTER LAVROV SAYS HAD INVITED KERRY TO RUSSIA TODAY, BUT KERRY SAID ON SATURDAY HE WOULD LIKE TO POSTPONE VISIT